Drilldown: Patents

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Patents > IPCs : IPC B64C27/04 or IPC F02B75/28 & Number of claims: 4-30

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Helicopter (17) · propulsion (7) · hybrid (6) · None (5) · airplane (5) · ascension (5) · propeller (5) · Propellers (5) · sustentation (4) · stability (3) · lift (3) · HTA (3) · steering (2) · whole (2)
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